Revenge of the Creature

In a tributary of the Amazon, a monster – half-man, half-fish – is captured and placed in a reservoir in a Florida national park to be observed by scientists.

• 
  John Agar

  Prof. Clete Ferguson
• 
  Lori Nelson

  Helen Dobson
• 
  John Bromfield

  Joe Hayes
• 
  Nestor Paiva

  Captain Lucas
• 
  Grandon Rhodes

  Jackson Foster
• 
  Dave Willock

  Lou Gibson
• 
  Robert B. Williams

  George Johnson
• 
  Charles Cane

  Police Captain
• 
  Loretta Agar

  Woman on Boat (uncredited)
• 
  Bill Baldwin

  Patrol Boat Dispatcher (voice / uncredited)